diff options
Diffstat (limited to 'gcc-4.8.1/libgo/go/syscall/sockcmsg_unix.go')
-rw-r--r-- | gcc-4.8.1/libgo/go/syscall/sockcmsg_unix.go | 113 |
1 files changed, 0 insertions, 113 deletions
diff --git a/gcc-4.8.1/libgo/go/syscall/sockcmsg_unix.go b/gcc-4.8.1/libgo/go/syscall/sockcmsg_unix.go deleted file mode 100644 index 951bc18fc..000000000 --- a/gcc-4.8.1/libgo/go/syscall/sockcmsg_unix.go +++ /dev/null @@ -1,113 +0,0 @@ -// Copyright 2011 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -// +build darwin freebsd linux netbsd openbsd - -// Socket control messages - -package syscall - -import ( - "runtime" - "unsafe" -) - -// Round the length of a raw sockaddr up to align it propery. -func cmsgAlignOf(salen int) int { - salign := int(sizeofPtr) - // NOTE: It seems like 64-bit Darwin kernel still requires 32-bit - // aligned access to BSD subsystem. - if darwinAMD64 { - salign = 4 - } - // NOTE: Solaris always uses 32-bit alignment, - // cf. _CMSG_DATA_ALIGNMENT in <sys/socket.h>. - if runtime.GOOS == "solaris" { - salign = 4 - } - if salen == 0 { - return salign - } - return (salen + salign - 1) & ^(salign - 1) -} - -// CmsgLen returns the value to store in the Len field of the Cmsghdr -// structure, taking into account any necessary alignment. -func CmsgLen(datalen int) int { - return cmsgAlignOf(SizeofCmsghdr) + datalen -} - -// CmsgSpace returns the number of bytes an ancillary element with -// payload of the passed data length occupies. -func CmsgSpace(datalen int) int { - return cmsgAlignOf(SizeofCmsghdr) + cmsgAlignOf(datalen) -} - -func cmsgData(h *Cmsghdr) unsafe.Pointer { - return unsafe.Pointer(uintptr(unsafe.Pointer(h)) + SizeofCmsghdr) -} - -// SocketControlMessage represents a socket control message. -type SocketControlMessage struct { - Header Cmsghdr - Data []byte -} - -// ParseSocketControlMessage parses b as an array of socket control -// messages. -func ParseSocketControlMessage(b []byte) ([]SocketControlMessage, error) { - var msgs []SocketControlMessage - for len(b) >= CmsgLen(0) { - h, dbuf, err := socketControlMessageHeaderAndData(b) - if err != nil { - return nil, err - } - m := SocketControlMessage{Header: *h, Data: dbuf[:int(h.Len)-cmsgAlignOf(SizeofCmsghdr)]} - msgs = append(msgs, m) - b = b[cmsgAlignOf(int(h.Len)):] - } - return msgs, nil -} - -func socketControlMessageHeaderAndData(b []byte) (*Cmsghdr, []byte, error) { - h := (*Cmsghdr)(unsafe.Pointer(&b[0])) - if h.Len < SizeofCmsghdr || int(h.Len) > len(b) { - return nil, nil, EINVAL - } - return h, b[cmsgAlignOf(SizeofCmsghdr):], nil -} - -// UnixRights encodes a set of open file descriptors into a socket -// control message for sending to another process. -func UnixRights(fds ...int) []byte { - datalen := len(fds) * 4 - b := make([]byte, CmsgSpace(datalen)) - h := (*Cmsghdr)(unsafe.Pointer(&b[0])) - h.Level = SOL_SOCKET - h.Type = SCM_RIGHTS - h.SetLen(CmsgLen(datalen)) - data := uintptr(cmsgData(h)) - for _, fd := range fds { - *(*int32)(unsafe.Pointer(data)) = int32(fd) - data += 4 - } - return b -} - -// ParseUnixRights decodes a socket control message that contains an -// integer array of open file descriptors from another process. -func ParseUnixRights(m *SocketControlMessage) ([]int, error) { - if m.Header.Level != SOL_SOCKET { - return nil, EINVAL - } - if m.Header.Type != SCM_RIGHTS { - return nil, EINVAL - } - fds := make([]int, len(m.Data)>>2) - for i, j := 0, 0; i < len(m.Data); i += 4 { - fds[j] = int(*(*int32)(unsafe.Pointer(&m.Data[i]))) - j++ - } - return fds, nil -} |